import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

@WebServlet(name = "LServlet")
public class LServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        if (!ServletFileUpload.isMultipartContent(request)){
            return;
        }
        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload= new ServletFileUpload(factory);
        String path= getServletContext().getRealPath("./")+File.separator+"upload";
        File uploadDir = new File(path);
        if (!uploadDir.exists()){
            uploadDir.mkdirs();
        }
        try {
            List<FileItem>fileItems= upload.parseRequest(request);
            if (fileItems!=null&&fileItems.size()>0){
                for (FileItem fileItem : fileItems) {
                    String fileName = new File(fileItem.getName()).getName();
                    String filepath = path+File.separator+fileName;
                    File file = new File(filepath);
                    fileItem.write(file);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}
